<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>request</title>
</head>
<body>

<h1>request</h1>
<!-- 客户端数据发送到服务端 -->
<form action="servlet3" method="post">
    <!-- 用户名 -->
    <input type="text" name="username">
    <input type="password" name="pass">
    <!-- 提交  -->
    <input type="submit" value="提交">
</form>
</body>
</html>